mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-15 10:53:46 +01:00
256 lines
7.6 KiB
Go
256 lines
7.6 KiB
Go
// Copyright 2018 New Vector Ltd
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// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package postgres
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import (
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"context"
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"database/sql"
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"encoding/json"
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"time"
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"github.com/matrix-org/gomatrixserverlib"
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log "github.com/sirupsen/logrus"
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)
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const appserviceEventsSchema = `
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-- Stores events to be sent to application services
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CREATE TABLE IF NOT EXISTS appservice_events (
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-- An auto-incrementing id unique to each event in the table
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id BIGSERIAL NOT NULL PRIMARY KEY,
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-- The ID of the application service the event will be sent to
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as_id TEXT NOT NULL,
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-- JSON representation of the event
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headered_event_json TEXT NOT NULL,
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-- The ID of the transaction that this event is a part of
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txn_id BIGINT NOT NULL
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);
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CREATE INDEX IF NOT EXISTS appservice_events_as_id ON appservice_events(as_id);
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`
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const selectEventsByApplicationServiceIDSQL = "" +
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"SELECT id, headered_event_json, txn_id " +
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"FROM appservice_events WHERE as_id = $1 ORDER BY txn_id DESC, id ASC"
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const countEventsByApplicationServiceIDSQL = "" +
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"SELECT COUNT(id) FROM appservice_events WHERE as_id = $1"
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const insertEventSQL = "" +
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"INSERT INTO appservice_events(as_id, headered_event_json, txn_id) " +
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"VALUES ($1, $2, $3)"
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const updateTxnIDForEventsSQL = "" +
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"UPDATE appservice_events SET txn_id = $1 WHERE as_id = $2 AND id <= $3"
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const deleteEventsBeforeAndIncludingIDSQL = "" +
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"DELETE FROM appservice_events WHERE as_id = $1 AND id <= $2"
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const (
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// A transaction ID number that no transaction should ever have. Used for
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// checking again the default value.
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invalidTxnID = -2
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)
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type eventsStatements struct {
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selectEventsByApplicationServiceIDStmt *sql.Stmt
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countEventsByApplicationServiceIDStmt *sql.Stmt
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insertEventStmt *sql.Stmt
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updateTxnIDForEventsStmt *sql.Stmt
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deleteEventsBeforeAndIncludingIDStmt *sql.Stmt
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}
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func (s *eventsStatements) prepare(db *sql.DB) (err error) {
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_, err = db.Exec(appserviceEventsSchema)
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if err != nil {
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return
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}
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if s.selectEventsByApplicationServiceIDStmt, err = db.Prepare(selectEventsByApplicationServiceIDSQL); err != nil {
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return
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}
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if s.countEventsByApplicationServiceIDStmt, err = db.Prepare(countEventsByApplicationServiceIDSQL); err != nil {
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return
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}
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if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
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return
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}
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if s.updateTxnIDForEventsStmt, err = db.Prepare(updateTxnIDForEventsSQL); err != nil {
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return
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}
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if s.deleteEventsBeforeAndIncludingIDStmt, err = db.Prepare(deleteEventsBeforeAndIncludingIDSQL); err != nil {
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return
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}
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return
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}
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// selectEventsByApplicationServiceID takes in an application service ID and
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// returns a slice of events that need to be sent to that application service,
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// as well as an int later used to remove these same events from the database
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// once successfully sent to an application service.
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func (s *eventsStatements) selectEventsByApplicationServiceID(
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ctx context.Context,
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applicationServiceID string,
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limit int,
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) (
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txnID, maxID int,
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events []gomatrixserverlib.HeaderedEvent,
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eventsRemaining bool,
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err error,
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) {
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defer func() {
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if err != nil {
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log.WithFields(log.Fields{
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"appservice": applicationServiceID,
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}).WithError(err).Fatalf("appservice unable to select new events to send")
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}
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}()
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// Retrieve events from the database. Unsuccessfully sent events first
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eventRows, err := s.selectEventsByApplicationServiceIDStmt.QueryContext(ctx, applicationServiceID)
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if err != nil {
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return
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}
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defer checkNamedErr(eventRows.Close, &err)
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events, maxID, txnID, eventsRemaining, err = retrieveEvents(eventRows, limit)
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if err != nil {
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return
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}
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return
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}
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// checkNamedErr calls fn and overwrite err if it was nil and fn returned non-nil
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func checkNamedErr(fn func() error, err *error) {
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if e := fn(); e != nil && *err == nil {
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*err = e
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}
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}
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func retrieveEvents(eventRows *sql.Rows, limit int) (events []gomatrixserverlib.HeaderedEvent, maxID, txnID int, eventsRemaining bool, err error) {
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// Get current time for use in calculating event age
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nowMilli := time.Now().UnixNano() / int64(time.Millisecond)
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// Iterate through each row and store event contents
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// If txn_id changes dramatically, we've switched from collecting old events to
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// new ones. Send back those events first.
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lastTxnID := invalidTxnID
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for eventsProcessed := 0; eventRows.Next(); {
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var event gomatrixserverlib.HeaderedEvent
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var eventJSON []byte
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var id int
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err = eventRows.Scan(
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&id,
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&eventJSON,
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&txnID,
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)
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if err != nil {
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return nil, 0, 0, false, err
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}
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// Unmarshal eventJSON
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if err = json.Unmarshal(eventJSON, &event); err != nil {
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return nil, 0, 0, false, err
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}
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// If txnID has changed on this event from the previous event, then we've
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// reached the end of a transaction's events. Return only those events.
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if lastTxnID > invalidTxnID && lastTxnID != txnID {
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return events, maxID, lastTxnID, true, nil
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}
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lastTxnID = txnID
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// Limit events that aren't part of an old transaction
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if txnID == -1 {
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// Return if we've hit the limit
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if eventsProcessed++; eventsProcessed > limit {
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return events, maxID, lastTxnID, true, nil
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}
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}
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if id > maxID {
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maxID = id
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}
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// Portion of the event that is unsigned due to rapid change
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// TODO: Consider removing age as not many app services use it
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if err = event.SetUnsignedField("age", nowMilli-int64(event.OriginServerTS())); err != nil {
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return nil, 0, 0, false, err
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}
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events = append(events, event)
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}
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return
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}
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// countEventsByApplicationServiceID inserts an event mapped to its corresponding application service
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// IDs into the db.
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func (s *eventsStatements) countEventsByApplicationServiceID(
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ctx context.Context,
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appServiceID string,
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) (int, error) {
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var count int
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err := s.countEventsByApplicationServiceIDStmt.QueryRowContext(ctx, appServiceID).Scan(&count)
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if err != nil && err != sql.ErrNoRows {
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return 0, err
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}
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return count, nil
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}
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// insertEvent inserts an event mapped to its corresponding application service
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// IDs into the db.
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func (s *eventsStatements) insertEvent(
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ctx context.Context,
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appServiceID string,
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event *gomatrixserverlib.HeaderedEvent,
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) (err error) {
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// Convert event to JSON before inserting
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eventJSON, err := json.Marshal(event)
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if err != nil {
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return err
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}
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_, err = s.insertEventStmt.ExecContext(
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ctx,
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appServiceID,
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eventJSON,
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-1, // No transaction ID yet
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)
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return
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}
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// updateTxnIDForEvents sets the transactionID for a collection of events. Done
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// before sending them to an AppService. Referenced before sending to make sure
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// we aren't constructing multiple transactions with the same events.
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func (s *eventsStatements) updateTxnIDForEvents(
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ctx context.Context,
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appserviceID string,
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maxID, txnID int,
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) (err error) {
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_, err = s.updateTxnIDForEventsStmt.ExecContext(ctx, txnID, appserviceID, maxID)
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return
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}
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// deleteEventsBeforeAndIncludingID removes events matching given IDs from the database.
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func (s *eventsStatements) deleteEventsBeforeAndIncludingID(
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ctx context.Context,
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appserviceID string,
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eventTableID int,
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) (err error) {
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_, err = s.deleteEventsBeforeAndIncludingIDStmt.ExecContext(ctx, appserviceID, eventTableID)
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return
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}
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